Game Controls for New Metal Slug
This game is not in English language, so Left Click on the Second Button on the title screen to view the instructions and then Left Click the bottom right button to continue. Then select a difficulty level from the three buttons shown. Finally select your character to begin the game.
You can also change the control keys. Left Click on the Third Button on the title screen and press the desired keys for the different default controls. Finally click on the Left Button to save your changes. If you click the Right Button then the default controls will be restored.